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Journal Article Multifunctional separators for lithium secondary batteries via in-situ surface modification of hydrophobic separator using aqueous binders
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Authors
Ju Young Kim, Seok Hun Kang, Young-Sam Park, Jaecheol Choi, Hyeong Min Jin, Dong Ok Shin, Myeong Ju Lee, Young-Gi Lee
Issue Date
2023-06
Citation
Surfaces and Interfaces, v.38, pp.1-9
ISSN
2468-0230
Publisher
Elsevier
Language
English
Type
Journal Article
DOI
https://dx.doi.org/10.1016/j.surfin.2023.102828
Project Code
23JB3600, The Bridge Technology Development of 600Wh/L-Class Large Area All-Solid-State Battery for EVs based on Battery System Design+, Young-Gi Lee
Abstract
Advanced batteries with specialized functions can be fabricated by utilizing functional separators that consist of unique functional materials coated on the separator surface. However, currently commercialized separators are made of polyolefin fibers, which are hydrophobic in nature, making it difficult to utilize aqueous slurries for the coating process of functional materials due to dewetting of slurries on the separator surface. Herein, we present an intriguing fabrication method utilizing polyvinyl alcohol (PVA) binder for in-situ surface modification of hydrophobic separators, which results in favorable wetting behavior against all kinds of aqueous slurries. Dynamic contact angle measurement was employed to evaluate the wettability of the modified separator surface, and a near-zero degree receding contact angle was obtained for the PVA-treated separator. As a demonstration, aqueous slurries that could not be coated on hydrophobic separators by themselves were successfully coated uniformly using PVA as a surface modifier. In addition, using the proposed fabrication method, a ceramic-coated separator with enhanced thermal stability and adhesion strength was demonstrated with negligible deterioration of lithium-ion transport. This method, using cost-effective and eco-friendly aqueous binders, can successfully fabricate functional separators for various advanced batteries with superior features.
KSP Keywords
Adhesion strength, Advanced batteries, Aqueous binder, Aqueous slurries, Ceramic-coated separator, Coating process, Contact angle(CA), Contact angle measurements, Dynamic contact angle, Eco-friendly, Fabrication method
This work is distributed under the term of Creative Commons License (CCL)
(CC BY NC ND)
CC BY NC ND